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Rare earth doped scandium barium aluminate up-conversion luminescent material and preparation method thereof

A luminescent material, rare earth doping technology, applied in luminescent materials, chemical instruments and methods, sustainable manufacturing/processing, etc., can solve the problems of low controllability, low repeatability, low preparation yield, etc. The effect of good performance, simple preparation process and high yield

Active Publication Date: 2020-03-17
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The present invention aims at the technical problems of low preparation yield, low degree of controllability, low repeatability and high cost of raw materials in the above-mentioned prior art of up-conversion luminescent materials, and proposes a rare earth compound with good repeatability, high yield and simple preparation process. Scandium-doped barium aluminate up-conversion material and its preparation method provide new materials for the application of scandium-barium aluminate in lighting, display and even biomedical fields

Method used

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  • Rare earth doped scandium barium aluminate up-conversion luminescent material and preparation method thereof
  • Rare earth doped scandium barium aluminate up-conversion luminescent material and preparation method thereof
  • Rare earth doped scandium barium aluminate up-conversion luminescent material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] What this example prepares is Ba 2 sc 0.67 Yb 0.3 Er 0.03 AlO 5Powder, prepared as follows:

[0034] Calculate 0.01976mol of barium carbonate, 0.00255mol of scandium oxide, 0.00114mol of ytterbium oxide, and 0.00011mol of erbium oxide according to the molar ratio of elements Ba, Sc, Yb, Er, and Al: 2.6:0.67:0.3:0.03:1 and 0.00760mol of aluminum hydroxide quality, and accurately weighed. Put all the raw materials into a beaker, and add 25 ml of absolute ethanol as a dispersion medium, stir with a glass rod to make the suspension fully uniform, let it stand for 4 minutes, put the beaker into a drying oven, and set the drying temperature to 80°C , record the initial drying time, and dry for 10 hours to completely evaporate the water vapor and absolute ethanol in the sample. Take out the beaker, roughly divide the precursor powder into 4 parts, press the divided sample powder into a disc shape with a tablet press, and keep the pressure gauge at 16Mpa for about ten min...

Embodiment 2

[0038] Prepare Ba according to the steps of Example 1 2 sc 0.67 Yb 0.3 Er 0.03 AlO 5 For the powder, only the sintering step in Example 1 is first kept at 1200°C for 20 minutes, then at 1700°C for 90 minutes, adjusted to first at 1200°C for 20 minutes, then at 1500°C for 90 minutes, and other steps remain unchanged. The purpose is to repeat the test to verify the feasibility of the present invention under different high temperature conditions.

[0039] Figure 7 The X-ray diffraction results showed that the crystal structure of the sample conformed to the Ba 2 ScAlO 5 Crystal structure (PDF card number 43-0078), indicating that the product is a single-phase Ba that also has a hexagonal close-packed structure 2 ScAlO 5 (beta phase).

[0040] Depend on Figure 8 It can be seen from the wavelength-luminous intensity relationship diagram that, also excited by a 980nm infrared laser, the red light wavelength at 666nm has a maximum luminous intensity of 8858.63, and the ex...

Embodiment 3

[0042] What this example prepares is Ba 2 sc 0.68 Yb 0.3 Er 0.02 AlO 5 Powder, the difference between this embodiment and embodiment 1 is that the content of erbium oxide is adjusted from 0.00011 mol to 0.00007 mol, and other steps remain unchanged. The purpose is to verify the stability of the present invention in regulating raw material composition and manufacturing process after regulating the ratio of rare earth oxides.

[0043] Figure 9 The X-ray diffraction results showed that the crystal structure of the sample conformed to the Ba 2 ScAlO 5 Crystal Structure (PDF Card No. 43-0078).

[0044] Depend on Figure 10 The wavelength-luminous intensity relationship diagram shows that Ba 2 sc 0.68 Yb 0.3 Er 0.02 AlO 5 The powder is also excited by a 980nm infrared laser. The red light wavelength at 667nm has a maximum luminous intensity of 8061.92, and the excited secondary maximum wavelength of 689nm has a light intensity of 4003.3.

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Abstract

The invention discloses a rare earth doped scandium barium aluminate up-conversion luminescent material and a preparation method thereof, and belongs to the technical field of luminescent materials. The up-conversion luminescent material provided by the invention has the structural formula of Ba2Sc(1-x-y)YbxEryAlO5, wherein x is equal to 0.1 to 0.6, and y is equal to 0.01 to 0.07. The preparationmethod is a high-temperature solid-phase method, and comprises the steps: by taking barium carbonate, scandium oxide, ytterbium oxide, erbium oxide and aluminum hydroxide as raw materials, uniformly mixing the raw materials by using absolute ethyl alcohol, drying, pressing into pieces, and carrying out high-temperature solid-phase sintering in a hydrogen furnace at the temperature of 1500 DEG C-1700 DEG C. The prepared rare earth doped scandium barium aluminate up-conversion luminescent material has excellent luminescent property, the highest relative luminescent intensity can reach 8701.14, the corresponding red light wavelength is 665 nm, and the luminescent intensity can be regulated and controlled by adjusting the proportion of doped rare earth. Meanwhile, the preparation method is good in repeatability, high in yield, simple and feasible in preparation process, more energy-saving and environment-friendly in preparation process and suitable for industrial popularization.

Description

technical field [0001] The invention belongs to the technical field of luminescent materials, and in particular relates to a rare earth-doped scandium-barium aluminate up-conversion luminescent material and a preparation method thereof. Background technique [0002] For more than half a century, the research on alkaline earth metals and rare earth oxides has made unprecedented achievements, especially the barium oxide-scandium oxide system. Many researchers have developed abundant crystal phases and studied the structures and properties of these crystals in detail. optical properties. Among them, scandate has been applied in many fields, such as applying it to hot cathodes in vacuum electronic devices to improve the electron emission performance and service life of cathodes; another example is to propose a new type of scandium doped with rare earth ternary barium Salt (Ba 3 sc 4 o 9 ), which can be used as a luminescent material for safety signs, billboards, etc. [000...

Claims

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Application Information

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IPC IPC(8): C09K11/80
CPCC09K11/7774Y02P20/10
Inventor 付浩黄政虎胡俊山王若男熊汇雨伍风翼罗勇
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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